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Author Question: Who first used RR Lyrae variable stars to determine distances in our Milky Way galaxy? a. ... (Read 68 times)

awywial

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on: Jul 27, 2018
Who first used RR Lyrae variable stars to determine distances in our Milky Way galaxy?
 
  a. Henrietta Leavitt
  b. Edwin Hubble
  c. John Glenn
  d. Carl Sagan
  e. Harlow Shapley

Question 2

How does the luminosity depend on temperature for stars of the same size?
 
  What will be an ideal response?


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xthemafja

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Reply #1 on: Jul 27, 2018
Answer to Question 1

e

Answer to Question 2

The relationship among luminosity, radius, and temperature tells us that luminosity is proportional to the surface area and to temperature to the fourth power. For stars of the same size (same surface area), L is proportional to T2.


awywial

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Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

raenoj

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Reply 3 on: Yesterday
Wow, this really help

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